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Analog Devices Inc. LT7171RV#TRMPBF
- Part No.:
- LT7171RV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 30-PowerTFQFN
- Datasheet:
-
LT7171RV#TRMPBF.pdf
- Description:
- IC REG BUCK PROG 20A 30LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:950
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Product details
Overview
LT7171RV#TRMPBF from Analog Devices is a monolithic dual-phase synchronous step-down regulator delivering up to 20A continuous output current with PMBus/I²C digital power system management. It operates from 2.9V–16V input, supports 0.4V–5.5V programmable VOUT with ±0.25% accuracy (0.6V–1.375V), and features Silent Switcher® architecture for low EMI in compact layouts. It is used in high-density data center power supplies requiring precise telemetry and phase synchronization.
For engineers reviewing the LT7171RV#TRMPBF datasheet, LT7171RV#TRMPBF pinout, LT7171RV#TRMPBF application, or LT7171RV#TRMPBF equivalent, key selection criteria include dual-phase valley current-mode control, 25ns minimum on-time, 3× programmable NVM, differential remote sensing, and PolyPhase load sharing across up to four devices.
Technical Context
The LT7171RV#TRMPBF implements controlled-on-time valley current-mode control with 25ns typical minimum on-time, enabling high-frequency operation (400kHz–4MHz) at low output voltages while maintaining fast transient response. Its dual-phase architecture uses two independent switching legs (SW0/SW1) with dedicated BOOST0/BOOST1 and shared SHARE_CLK for synchronized interleaving.
Digital control is implemented via PMBus 1.3-compliant I²C interface supporting full telemetry readback (VOUT, IOUT, VIN, die temperature, faults) and configuration of voltage, current limit, soft start, sequencing, loop compensation, and phase offset. All settings can be stored in on-chip three-times-programmable NVM or set by external resistors on VOUT_CFG, PWM_CFG, and ASEL pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V–16V (or 1.5V–16V with EXTVCC ≥3V); enables wide-input industrial and server rail compatibility. |
| VOUT Range & Accuracy | 0.4V–5.5V programmable; ±0.25% over 0.6V–1.375V ensures tight regulation for CPU/GPU core rails. |
| Output Current | 20A continuous (dual-phase, 10A per phase); supports high-current ASIC/FPGA power domains. |
| Switching Frequency | 400kHz–4MHz; selectable via resistor or PMBus; allows optimization of size vs. efficiency vs. EMI. |
| Min On-Time | 25ns typical; enables 1V-out operation at 4MHz without pulse-skipping, preserving transient response. |
| Telemetry Resolution | READ_VOUT ±0.2% (0.6V–1.375V); READ_IOUT DC accuracy ±300mA (≤10A) enables precise power budgeting. |
| NVM Endurance | 3 write cycles; sufficient for final production configuration lock without field reprogramming risk. |
Pinout & Package
LT7171RV#TRMPBF is housed in a 30-lead, 3.5mm × 4mm LQFN package with exposed thermal pad (EP). The package supports high-power dissipation via bottom-side thermal vias to internal ground planes and requires strict PCB layout per Analog Devices' Layout Considerations (pp.47–48).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 24) | Main input power supply | Accepts 2.9V–16V; requires local 0.1µF + bulk 10µF decoupling per pin for stable high-di/dt operation. |
| SW0/SW1 (Pins 28–29, 25–26) | Switch node outputs | Drive external inductors in dual-phase buck topology; each phase rated for 10A peak valley current. |
| BOOST0/BOOST1 (Pins 30, 25) | Bootstrap supply inputs | Provide gate drive voltage for top FETs; require 0.1µF ceramic capacitor to respective SWx pin. |
| VSENSEP/VSENSEN (Pins 21–22) | Differential remote sense inputs | Enable Kelvin sensing of VOUT at load; reject PCB IR drop for ±0.25% regulation accuracy at point-of-load. |
| PWM_CFG/VOUT_CFG/ASEL (Pins 4–6) | Resistor-programmable configuration | Set fSW, VOUT, and I²C address at startup; eliminate need for firmware initialization in basic deployments. |
| SDA/SCL/ALERT/FAULT/PGOOD (Pins 15, 16, 33, 17, 14) | PMBus interface & status outputs | Support standard PMBus commands; open-drain ALERT asserts on any fault; PGOOD provides power-good timing with programmable delay. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated magnetic field cancellation reduces radiated EMI by >30dB vs. conventional buck regulators-enables pass EMC without shielding or ferrites. |
| Dual-Phase Valley Current Mode | Independent per-phase current limiting (3.6A–12.5A/phase) and 15° phase resolution enable precise load balancing and ripple cancellation in high-current rails. |
| Three-Times Programmable NVM | Stores final VOUT, fSW, sequencing, and compensation settings; eliminates boot-time resistor reads and enables secure configuration lockdown. |
| Differential Remote Sensing | VSENSEP/VSENSEN inputs reject up to 100mV of PCB trace resistance drop-ensures ±0.25% regulation accuracy at ASIC die pads, not regulator pins. |
| PMBus 1.3 Compliance | Full support for READ_VOUT, READ_IOUT, READ_TEMPERATURE, MFR_COMMON, STORE_USER_ALL, and CLEAR_FAULTS-integrates seamlessly with system-level power managers. |
Applications
| Server VR13/VR14 Core Power | AI Accelerator Board Power |
|---|---|
Use Scenario: Providing dynamically scaled 0.7V–1.1V core voltage to multi-core Xeon or EPYC CPUs with rapid load transients up to 100A/μs. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller with PMBus telemetry and event-based sequencing for coordinated power-up with memory and I/O rails. Use Value: 25ns min on-time and valley current mode deliver <1% undershoot during 50A step loads; telemetry enables real-time thermal derating in BIOS. | Use Scenario: Delivering 0.8V/30A to NVIDIA A100 GPU or AMD MI300X compute die on PCIe add-in card with space-constrained layout. IC Role / Device Role / Timing Role: High-density dual-phase regulator with Silent Switcher® EMI reduction to meet Class B emissions limits without metal shields. Use Value: 3.5mm × 4mm LQFN + integrated drivers reduce solution footprint by 40% vs. discrete controller + DrMOS; differential sensing maintains 0.8V ±2.5mV at die. |
| Enterprise SSD Power Rail | Industrial FPGA Power Management |
Use Scenario: Generating 1.2V/12A and 1.8V/6A for NAND flash controllers and DRAM buffers in U.2 NVMe SSDs with strict thermal envelope. IC Role / Device Role / Timing Role: Dual-output capable (via cascaded configuration) with independent VOUT programming and fault reporting per rail. Use Value: Integrated three-times NVM stores rail-specific soft-start times and UV/OV thresholds-eliminates external EEPROM and simplifies qualification. | Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA core (0.75V/15A) and auxiliary (1.8V/3A) rails in ruggedized edge computing systems operating from 12VDC input. IC Role / Device Role / Timing Role: Robust dual-phase controller with −40°C to +125°C TJ rating, EXTVCC support for 1.5V VIN operation, and overtemperature shutdown. Use Value: Forced-continuous conduction mode prevents audible noise; PMBus telemetry enables predictive maintenance via junction temperature trending. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase digital buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7151S#TRPBF | Single-phase, 25A max; identical Silent Switcher® architecture and PMBus interface but no dual-phase capability. | Suitable only for ≤25A single-rail applications; lacks PolyPhase load sharing and phase synchronization signals (SHARE_CLK). | Select when output current demand is ≤25A and board space permits larger inductor; retains same GUI (LTpowerPlay®) and register map. |
| TPS546D24RQFT | 6V–18V VIN, 60A max (dual-phase), PMBus 1.3, but no Silent Switcher®; higher EMI requires more filtering. | Higher current capacity and wider VIN range, but larger 5mm × 5.5mm QFN package and no integrated NVM-requires external EEPROM for configuration storage. | Select for >20A needs where EMI is managed externally; verify layout compatibility due to different pinout and thermal pad geometry. |
Compared with LT7171RV#TRMPBF, LTC7151S#TRPBF offers higher per-phase current but no phase interleaving benefit, while TPS546D24RQFT delivers greater total current and VIN range at the cost of increased EMI design effort and loss of on-chip NVM configuration retention.
Availability
LT7171RV#TRMPBF is available at Aetrix Electronics and suitable for data center power supplies, AI accelerator boards, and enterprise SSDs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT7171RV#TRMPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The LT7171RV#TRMPBF belongs to the Silent Switcher® digital power management product line, designed specifically for high-efficiency, low-EMI, digitally controllable DC/DC conversion in space-constrained, thermally demanding server and AI infrastructure applications.
FAQ
What is the maximum supported switching frequency for LT7171RV#TRMPBF?
The LT7171RV#TRMPBF supports a programmable switching frequency range from 400kHz to 4MHz. This range is selectable via external resistor on the PWM_CFG pin or through the PMBus interface. At 4MHz, the 25ns typical minimum on-time enables stable 1V output regulation without pulse-skipping, preserving transient response and minimizing output capacitor requirements. Frequency accuracy is ±7.5% across temperature and line conditions.
Does LT7171RV#TRMPBF support true dual-phase operation with interleaved switching?
Yes, LT7171RV#TRMPBF is the -1 variant and natively supports dual-phase interleaved operation with 0°–345° programmable phase offset in 15° steps. It drives two independent switch nodes (SW0 and SW1) with dedicated BOOST0/BOOST1 pins and shares clock synchronization via the SHARE_CLK pin, enabling precise phase alignment and ripple cancellation across up to four devices in PolyPhase configurations.
How is output voltage accuracy maintained under dynamic load conditions for LT7171RV#TRMPBF?
LT7171RV#TRMPBF maintains ±0.25% VOUT accuracy (0.6V–1.375V) under static conditions and sustains tight regulation during transients via valley current-mode control with 25ns minimum on-time, differential remote sensing (VSENSEP/VSENSEN), and programmable loop compensation. The error amplifier's transconductance (gMEA) is adjustable across five bits (37.5μS–4.8mS), allowing bandwidth and phase margin tuning to match specific output filter and load characteristics.
Can LT7171RV#TRMPBF operate with input voltage below 3V?
Yes, LT7171RV#TRMPBF supports VIN as low as 1.5V when EXTVCC is supplied between 3.0V and 5.5V. In this mode, the internal LDOs are powered from EXTVCC rather than VIN, enabling reliable startup and regulation from ultra-low input sources such as battery-backed 1.8V or 2.5V intermediate rails-critical for brownout resilience in storage and networking equipment.
What telemetry parameters are readable via PMBus on LT7171RV#TRMPBF?
LT7171RV#TRMPBF supports full PMBus 1.3 telemetry readback including READ_VOUT (output voltage), READ_IOUT (output current), READ_VIN (input voltage), READ_TEMPERATURE_1 (die temperature), and STATUS_WORD/STATUS_VOUT/STATUS_IOUT for real-time fault monitoring. Voltage accuracy is ±0.20% (0.6V–1.375V), current accuracy is ±300mA (≤10A), and temperature resolution is 1°C with ±3°C accuracy across –40°C to +125°C.
LT7171RV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®
- Package/Case:
- 30-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V, 2.9V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.4V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 20A
- Frequency - Switching:
- 400kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-LQFN (3.5x4)
LT7171RV#TRMPBF FAQ
1.How can I place an order for LT7171RV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT7171RV#TRMPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT7171RV#TRMPBF reliable?
The price and inventory of LT7171RV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT7171RV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT7171RV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT7171RV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT7171RV#TRMPBF?
LT7171RV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT7171RV#TRMPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT7171RV#TRMPBF?
For technical support, including LT7171RV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT7171RV#TRMPBF requirements.
6.How does Aetrix verify that LT7171RV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT7171RV#TRMPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT7171RV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT7171RV#TRMPBF?
All LT7171RV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT7171RV#TRMPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT7171RV#TRMPBF part is unused and in its original packaging.
Return procedure for LT7171RV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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